diff --git a/src/main/java/de/tum/in/www1/bamboo/server/ServerNotificationRecipient.java b/src/main/java/de/tum/in/www1/bamboo/server/ServerNotificationRecipient.java
index 35341ff..1882077 100644
--- a/src/main/java/de/tum/in/www1/bamboo/server/ServerNotificationRecipient.java
+++ b/src/main/java/de/tum/in/www1/bamboo/server/ServerNotificationRecipient.java
@@ -1,5 +1,8 @@
 package de.tum.in.www1.bamboo.server;
 
+import java.net.MalformedURLException;
+import java.net.URISyntaxException;
+import java.net.URL;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
@@ -18,7 +21,10 @@
 import com.atlassian.bamboo.plugin.descriptor.NotificationRecipientModuleDescriptor;
 import com.atlassian.bamboo.resultsummary.ResultsSummary;
 import com.atlassian.bamboo.template.TemplateRenderer;
+import com.atlassian.bamboo.utils.error.ErrorCollection;
+import com.atlassian.bamboo.utils.error.SimpleErrorCollection;
 import com.atlassian.bamboo.variable.CustomVariableContext;
+import com.atlassian.sal.api.message.I18nResolver;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
 
@@ -29,6 +35,8 @@ public class ServerNotificationRecipient extends AbstractNotificationRecipient
 
     private String webhookUrl = null;
 
+    private I18nResolver i18n;
+
     private TemplateRenderer templateRenderer;
 
     private ImmutablePlan plan;
@@ -58,15 +66,34 @@ public class ServerNotificationRecipient extends AbstractNotificationRecipient
 
     @Override
     public void populate(@NotNull Map<String, String[]> params) {
-        for (String next : params.keySet()) {
-            System.out.println("next = " + next);
-        }
         if (params.containsKey(WEBHOOK_URL)) {
-            int i = params.get(WEBHOOK_URL).length - 1;
-            this.webhookUrl = params.get(WEBHOOK_URL)[i];
+            this.webhookUrl = this.getParam(WEBHOOK_URL, params);
+        }
+    }
+
+    private boolean isValidURL(String url) {
+        try {
+            new URL(url).toURI();
+            return true;
+        }
+        catch (MalformedURLException | URISyntaxException e) {
+            return false;
         }
     }
 
+    @NotNull
+    @Override
+    public ErrorCollection validate(@NotNull Map<String, String[]> params) {
+        ErrorCollection errorCollection = new SimpleErrorCollection();
+
+        webhookUrl = this.getParam(WEBHOOK_URL, params);
+        if (webhookUrl != null && (webhookUrl.isEmpty() || !isValidURL(webhookUrl))) {
+            errorCollection.addError(WEBHOOK_URL, i18n.getText("server.webhookUrl.invalid"));
+        }
+
+        return errorCollection;
+    }
+
     @Override
     public void init(@Nullable String configurationData) {
 
@@ -168,4 +195,8 @@ public void setTemplateRenderer(TemplateRenderer templateRenderer) {
     public void setCustomVariableContext(CustomVariableContext customVariableContext) {
         this.customVariableContext = customVariableContext;
     }
+
+    public void setI18nResolver(I18nResolver i18n) {
+        this.i18n = i18n;
+    }
 }
diff --git a/src/main/resources/atlassian-plugin.xml b/src/main/resources/atlassian-plugin.xml
index 524b509..f811d60 100644
--- a/src/main/resources/atlassian-plugin.xml
+++ b/src/main/resources/atlassian-plugin.xml
@@ -20,6 +20,8 @@
         <interface>com.atlassian.bamboo.variable.VariableDefinitionManager</interface>
     </component-import>
 
+    <component-import key="i18nResolver" interface="com.atlassian.sal.api.message.I18nResolver"/>
+
     <component-import key="artifactLinkManager" interface="com.atlassian.bamboo.build.artifact.ArtifactLinkManager"/>
 
     <component-import key="buildLoggerManager" interface="com.atlassian.bamboo.build.BuildLoggerManager"/>
diff --git a/src/main/resources/english.properties b/src/main/resources/english.properties
index b7b5c5d..880d8f4 100644
--- a/src/main/resources/english.properties
+++ b/src/main/resources/english.properties
@@ -1 +1,2 @@
-server.webhookUrl = Server URL
\ No newline at end of file
+server.webhookUrl = Server URL
+server.webhookUrl.invalid = Please enter a valid URL
\ No newline at end of file